Not sure of the economics for you, but they guys at Corima have mended several discs and quads (even Zipps!) with far worse damage than that for us, at a very reasonable cost. Maybe £60GBP a wheel + postage.
They'd probably inject resin, patch and remould, along the lines of previous suggestions. They inspect first then quote if they think it's safely repairable, or return the damaged parts as 'un-repairable' for you to destroy...
Try Catherine Martin at email@example.com
If no response, I might be able to do it through us as we're Corima dealers in the UK (just wheelchair/handcycle stuff, officially, though) I'm at firstname.lastname@example.org
All the best,
Pause, take a breath and ask yourself: "What would Rastamouse